AddOn 4GB DDR4 SDRAM Memory Module - For Computer, Desktop PC, Notebook - 4 GB (1 x 4GB) - DDR4-2666/PC4-21300 DDR4 SDRAM - 2666 MHz - CL19 - Non-ECC - Unbuffered - 260-pin - SoDIMM - Lifetime Warranty

AddOn 4GB DDR4 SDRAM Memory Module - For Computer, Desktop PC, Notebook - 4 GB (1 x 4GB) - DDR4-2666/PC4-21300 DDR4 SDRAM - 2666 MHz - CL19 - Non-ECC - Unbuffered - 260-pin - SoDIMM - Lifetime Warranty